Method for measuring flexible netty surface shape by shooting

Abstract

The invention discloses a method for measuring a flexible netty surface shape by shooting. The method comprises the following steps of: 1), shooting a pre-printed mould plate with black and white grids at the different positions by using a camera; 2), calibrating the camera according to the shot photos and computing inner parameters and outer parameters of the different gestures of the camera; 3), shooting a netty panel and a grid mould plate at at least two different positions as a whole; 4), reading the grids of the mould plate from the shot photos so as to compute the position of the camera during shooting measurement, reading and analyzing nodes on the netty surfaces of the photos; 5), reconstructing the surface shape of the netty surface by combining the parameters of the camera obtained in the step 2) and the computed position of the camera; and 6), performing surface fitting according to the theory surface shape equation of the netty surface and counting errors of the surface shape. The method belongs to non-contact highly-effective measurement, is simple in process, high in automatic degree and low in cost and can be widely applied to the other related industry fields.

Description

technical field [0001] The invention relates to a single-camera-based flexible mesh surface shape photographic measurement method, which is especially suitable for detecting the surface shape of a radio telescope or a radar antenna mesh panel. Background technique [0002] There are many theories and methods for the detection and adjustment of non-porous solid panels commonly used in radio telescopes or radar antennas, and the measurement methods are also different and have their own advantages, such as optical methods, radio holography, and laser measurement methods. However, there has been no good simple and fast detection method for the surface shape measurement of shaped panels. The curved surface of the mesh panel is generally a paraboloid, and the commonly used size is generally up to 2m x 2m. Generally, a steel wire with a diameter of about 0.5mm is used, and the mesh size is generally about 10mm. The characteristics of the mesh shape determine the difficulty and com...

AI Technical Summary

Problems solved by technology

However, the traditional binocular stereo vision photogrammetry method requires two cameras, and it is necessary to design and manufacture a bracket for installing and adjusting the camera attitude. In this way, different sizes of mesh detection have different requirements for the adjustable attitude range of the bracket.

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